Update HdrHistogram_c 0.9.8 -> 0.9.11 (#112)
Update HdrHistogram_c 0.9.8 -> 0.9.11 (#112)

Signed-off-by: Otto van der Schaaf <f82e1104fcd8bfffc72e7185709f7902b0b97ebf@we-amp.com>

envoyproxy/nighthawk,envoyproxy/nighthawk,envoyproxy/nighthawk,envoyproxy/nighthawk